'''
Created on Nov 18, 2014

@author: mike
'''
import sys


def main():

    menu = "\nTemperature Convertor\n\n"+\
        "1. Celsius to Fahrenheit\n"+\
        "2. Celsius to Kelvin\n"+\
        "3. Fahrenheit to Celsius\n"+\
        "4. Fahrenheit to Kelvin\n"+\
        "5. Kelvin to Celsius\n"+\
        "6. Kelvin to Fahrenheit\n"+\
        "7. Quit"

    user_input = 0
    while user_input != 7:
        print menu
        user_input = raw_input("Please enter a valid selection: ")

        try:
            user_input = int(user_input)
        except:
            print user_input + " is not a valid selection, please try again\n"

        if user_input == 1:
            print str(user_input) + " degree Celsius is " + str((c2f(user_input))) + " degree Fahrenheit"
            sys.exit()
        elif user_input == 2:
            print str(user_input) + " degree Celsius is " + str((c2k(user_input))) + " degree Kelvin"
            sys.exit()
        elif user_input == 3:
            print str(user_input) + " degree Fahrenheit is " + str((f2c(user_input))) + " degree Celsius"
            sys.exit()
        elif user_input == 4:
            print str(user_input) + " degree Fahrenheit is " + str((f2k(user_input))) + " degree Kelvin"
            sys.exit()
        elif user_input == 5:
            print str(user_input) + " degree Kelvin is " + str((k2c(user_input))) + " degree Celsius"
            sys.exit()
        elif user_input == 6:
            print str(user_input) + " degree Kelvin is " + str((k2f(user_input))) + " degree Fahrenheit"
            sys.exit()
        elif user_input == 7:
            sys.exit()
        else:
            print str(user_input) + " is not a valid selection, please try again\n"

def c2f(t):
    return (t*9/5.0)+32

def c2k(t):
    return t+273.15

def f2c(t):
    return (t-32)*5.0/9

def f2k(t):
    return (t+459.67)*5.0/9

def k2c(t):
    return t-273.15

def k2f(t):
    return (t*9/5.0)-459.67

if __name__ == "__main__":
    main()